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2025-02-11T21:26:27Z

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==Accessory bone==

An '''accessory bone''' is a bone that is not normally present in the human body but can occur as a variant in some individuals. These bones are often found in the [[foot]], [[wrist]], and other areas of the body. They are usually asymptomatic but can sometimes cause pain or discomfort, especially if they interfere with normal joint function.

==Types of Accessory Bones==

===Foot===
The foot is a common location for accessory bones. Some of the notable accessory bones in the foot include:

* '''[[Os trigonum]]''': This is an accessory bone that can be found behind the [[talus]] bone in the ankle. It is present in a small percentage of the population and can sometimes cause pain, especially in athletes.

* '''[[Os tibiale externum]]''': Also known as the accessory navicular bone, this bone is located near the [[navicular bone]] in the foot. It can cause a condition known as accessory navicular syndrome, which may require treatment if symptomatic.

* '''[[Sesamoid bones]]''': These are small bones embedded within tendons. In the foot, they are commonly found beneath the [[first metatarsophalangeal joint]].

===Wrist===
Accessory bones in the wrist are less common but can include:

* '''Accessory bones of the wrist''': These can vary in number and location, sometimes causing confusion in diagnosis if not recognized as normal variants.

===Other Locations===
Accessory bones can also be found in other parts of the body, such as:

* '''[[Fabella]]''': A small sesamoid bone located in the tendon of the [[gastrocnemius muscle]] behind the knee.

==Clinical Significance==
While accessory bones are often asymptomatic, they can sometimes lead to clinical issues. For example, the presence of an accessory bone can alter the biomechanics of a joint, leading to pain or discomfort. In some cases, surgical intervention may be necessary to alleviate symptoms.

==Related pages==
* [[Sesamoid bone]]
* [[Human anatomy]]
* [[Skeletal system]]
* [[Orthopedics]]

==Gallery==
<gallery>
File:Fabella_with_arrow.jpg|Fabella
File:Accessory_bones_of_the_wrist.jpg|Accessory bones of the wrist
File:Sesamoid_bones_of_the_fingers.jpg|Sesamoid bones of the fingers
File:Accessory_bones_of_the_ankle.jpg|Accessory bones of the ankle
File:Accessory_and_sesamoid_bones_of_the_foot_-_dorsoplantar_projection.jpg|Accessory and sesamoid bones of the foot - dorsoplantar projection
File:Accessory_and_sesamoid_bones_of_the_foot_-_lateral_projection.jpg|Accessory and sesamoid bones of the foot - lateral projection
File:Os_tibiale_externum_Typen_1_-_3_nach_Geist_-_Roe.jpg|Os tibiale externum
File:Os_trigonum_-_Os_talonaviculare.jpg|Os trigonum - Os talonaviculare
File:Os_trigonum_1.jpg|Os trigonum 1
File:Os_trigonum2.jpg|Os trigonum 2
File:Os_trigonum_3.jpg|Os trigonum 3
</gallery>

[[Category:Anatomy]]
[[Category:Musculoskeletal system]]

Accessory bone - Revision history

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